Arc-lamp.



No..822, 240. PATENTED JUNE 5, 1906.

S. H. BLAKE & G. R. DAVISON.

ARC LAMP.

APPLICATION FILED SEPT. 22,1904.

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, which the following 10 UNITED STATES PATENT OFFICE.

SAMUEL H. BLAKE, OF JERSEY CITY, NEW JERSEY, AND GEORGE R. DAVISON, OF PITTSFIELD, MASSACHUSETTS, ASSIGNORS TO GEN- ERAL 1N CAN DESOEN T NE W YORK.

ARC LIGHT COMPANY, A CORPORATION OF ARC-LAMP- Patented June 5, 1906.

Application fil d September 22, 1904. semi No. 225,407.

To all whom, it mjtty concern:

Be it known that we, SAMUEL H. BLAKE,

residing at Jersey City, county of Hudson, State of New Jersey, and GEORGE R. DAVI- SON, residing at Pittsfield, county of Berkshire, State of Massachusetts, citizens of the United States, have invented certain new and useful Improvements in Arc-Lamps, of

is a specification. Our invention relates to electric-arc lamps and is particularly applicable to lamps of the inclosed-arc type. In this type of lamp the lead and support for the lower carbon are separated by only a small distance from the arc, and if the lead is not properly protected or if the support is not insulated from the lower carbon the arc is likely to spring from the upper carbon to the lead or support, thereby producing a short circuit and da1naging the lamp.

The object of our invention is to provide a novel arrangement for supporting the lower carbon and for conveying the current thereto which shall be simple and cheap to construct, which shall properly protect the lead for the lower carbon fromthe arc, and which shall effectively insulate the lower carbon and lead from the casing, thereby rendering the lamp safer to handle.

Our invention will best be understood from the accompanying drawings, in which Figures 1 and 2 show side elevations of a carbon-support constructed in accordance with our invention, and Fig. 3 shows anenlarged detailed view in cross-section on the line 1 1 in Fig. 2.

In the drawings, A represents the plate or cap, against which the globe B (shown in Fig. 2) is pressed by the adjustable support C. The upper carbon D passes through this plate and is insulated therefrom in the usual manner.

E re resents the support for the lower carbon, wliich may be stamped out from a single sheet of metal. This support E is split at both ends, as shown, the upper ends being bent back, so as to form ears by means of which the support may be conveniently attached to plate A by the screws (5 c. The support E is insulated from the plate A by the The central portion of the support E is bent to form a V-shaped, trough adapted to contain the lead F for the lower carbon.

The lead F is insulated from the support E by a number of insulated beads strung on lead F, as shown in Fig. 1. These beads may be of any suitable heat-resisting material, such as glass or porcelain. The lead F is insulated from plate A by the insulating-washers f. The split portion at the lower end of support E forms ears by means of which the lower-carbon holder G, which is formed as a split ring, may be firmly clamped in position. The support E is insulated from the split ring G by means of the U-shaped insulating-washer g. The lower end of lead F is clamped between the ends of split ring G, as shown in Fig. 3, thereby making excellent electrical contact therewith. The lower carbon D is supported in the split ring G by means of the thumb-screw H. It will be seenthat with this construction the lead F is fully protected from the are, so that all possibility of a short circuit, due to the arcs springing to the lead, is avoided. Moreover, the support E is entirely insulated from the lower carbon, so that there is no tendency for an arc to spring to the support. Fur thermore, the lower carbon, as well as the upper carbon, is effectively insulated from the frame, thereby rendering the lamp safe to handle.

What we claim as new, and desire to secure by Letters Patent of the United States, is

1. In an arc-lamp, a member having its central portion bent to form a trough and each end split to form a pair of ears, means for securing one set. of ears to a support and for insulating said ears therefrom, a carbonholder clamped between the other set of ears and insulated therefrom, and alead for the carbon passing through said trough and insulated therefrom and in electrical connection with said carbon-holder.

2. In an arc-lamp, a member having its central portion bent to form a trough and each end split to form a pair of ears, means for securing one set of ears to a support and for insulating said ears therefrom, a split member clamped between the other set of ears, and insulated therefrom, a conductor passing through said trough and insulated therefrom and clamped within said split member, and a carbon supported by said split member.

I 3. In an arc-lamp, a support, a member bent to form an ,inclosure for a lead secured l at one end to the support but insulated therei from, an electrode-holder secured to the other l end of the member but insulated therefrom, and a lead passing through said inelosure but insulated therefrom and electrically connect- 1 ed to said electrode-holder. i

4. In an arc-lamp, a support, a member l having its central portion bent to form an inl closure for a lead, ears formed at one end of i the member, means for securing the ears to i said support and insulating them therefrom, an electrode-holder carried by said member l at the other end thereof but insulated therei from, and a lead for the electrode passing l through said inclosure but insulated there- 1 from and electrically connected to said electrode-holder. I

5. In an arc-lamp, a support, a member formed. from a sheet-metal blank and bent to 1 form trough secured at one end to the support but insulated therefrom, an electrodeholder carried by the member at the other end thereof but insulated from the member, and a lead passing through said trough but insulated therefrom and electrically connected with said carbon-holder.

6. In an inclosed-arc lamp, atrough-shaped member, means for attaching one end of said member to a support and for insulating it therefrom, a carbon-holder secured to the other end of said member and insulated. therefrom, a conductor disposed within said mem- 1 her and electrically connected to said holder,

and. insulating beads on said conductor adapted to insulate said conductor from said member.

7. In an inclosed-arc lamp, a member split at both ends to form ears, means for attaching one set of ears to a support and for insulating them therefrom, a carbon-holder clamped between the other set of ears and insulated therefrom, a conductor disposed within said member and electrically connected to said carbon-holder, and insulating-beads on said conductor adapted to insulate said conductor from said member.

In witness whereof we have hereunto set our hands this 7th day of September, 190 1:.

- SAMUEL lil. BLAKE.

GEORGE lei. DAVISON. WVitnesses SAMUEL E. IVIDDIFIELD, AGNES GORMAN. 

